A single upload, a small batch, and one clean before and after comparison to see whether delivery reaches you.
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The usual error is treating a sample as a preview of results. It is not. Twenty units on one upload is a check of whether the order finds the file and whether anything on your side blocks it, and that is the entire claim being made. Reading it as a preview of what a full campaign feels like leads to disappointment that has nothing to do with the delivery.
The second mistake is checking too soon and too often. Refreshing a page you are signed in to gives you a cached figure and your own activity mixed together, which is a poor basis for any conclusion.
Write down the figure before you order. Compare it once, from a signed out browser, after the window has closed. One comparison beats ten, because the noise between checks is larger than the change you are looking for at this size.
If the two numbers differ by roughly what you expected, you have learned what a sample can teach you. Whether that is worth acting on depends on whether the upload deserves attention in the first place, and a demonstration has no opinion about that.
Short answers to what people ask most before ordering.